Brace and bit.



N. McINNES.

BRACE AND BIT. APPLICATION FILED SEPT. 25. 1914.

1,168,661. Paten ted (12111.18, 1916.

THE COLUMBIA PLANOGRAPH co., W AAAAAAAAAAAAA c.

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NORMAN MOINNES, OE CAPE GRACIAS, NICARAGUA, ASEIGNOR OF ONE-HALF TO GEORGE O. ESNYDER.

BRAGE AND BIT.

Specification of Letters Patent.

Patented Jain 118, 1916.

Continuation of application Serial No. 735,873, filed December 9, 1912. This application filer]. September To all whom it may concern Be it known that I, NORMAN lt lolnnns, a subject of the King of Great Britain, residing at Lone Star Mine, Cape Gracias, Nicaragua, Central America, have invented certain new and, useful improvements in Braces and Bits; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of the invention is to provide a simple and efiective means for securing a bit-shank to a brace-stock, and to that end I make use of a bit-shank with bent-over end in conjunction with a brace-stockhaving a groove and lateral recess adapted to receive the bit-shank and a retaining collar for holding the bit-shank in place.

I am aware that it has heretofore been proposed, as in United States Patent to Holliday No. 386,319 of July 17, 1888, to

use such parts" in combination, but in accordance with my invention 1 provide the brace-stock with a, cylindrical extension, containing the lateral recess and groove, and eccentric to the axis of rotation of the stock but so related thereto that the groove is concentric with the said axis of rotation. This cylindrical eccentric extension is embraced by a split spring retaining sleeve conveniently rotatable thereon to retain the bitshank in place. The result of this rearrangement and alteration of the parts is to produce a device of which the groove may be opened to receive the bit-shank, and then closed to retain it, by the mere rotation of the retaining sleeve, and in which the bitshank is held concentric with the axis of the brace-stock, corresponding exactly in this respect with the ordinary brace and bit and lending itself to the use of the concentric ratchet commonly employed with such instruments.

In carrying out the invention the cylindrical eccentric extension'may, if desired, be made integral with the brace-stock, but I prefer to make the brace-stock extension in the form of a detachable chuck, so that my invention may be applied to the stand Serial No. 663,437.

with the ratchet devices now commonly employed on such stocks.

Such an embodiment of my invention is illustrated in the accompanying drawings, in which i *igure 1 shows the devices and side elevation, Fig. 2 is a central vertical section, and Fig. 3 is a sectional plan on line 3-3 of Fig. l on a somewhat larger scale.

As here shown the brace 1 isthe ordinary stock 2 equipped with the ratchet 3 and pawls 4i, the ratchet being pinned to the shank 5 of the brace-stock extension or chuck formed, in accordance with my invention, with a cylindrical eccentric extension 6 embraced by a split spring sleeve 7 upheld by the pin 8 and conveniently rotatable on the cylindrical extension 6. This extension has at its base a lateral recess 9 continued as a groove extending lengthwise of the cylinder 6, said groove being concentric with the shank 5, and the lateral recess and groove being adapted to receive the bent-over end 10 and shank 8 of the bit.

It will be observed that by rotating the sleeve 7 the groove may be opened, and since the basal lateral recess is in an exposed portion of the chuck, the shank of the bit, with its bent-over end, may be dropped into the groove and recess, and then the turning of the sleeve 7 will close the slot and retain the shank of the drill in place. The brace and bit may then be used in the ordinary way, employing the ratchet mechanism if desired.

What I claim is:

1. A bit-stock for carpenters braces having a body portion and an extended cylindrical eccentric supporting stem having a lateral base recess continued as a groove lengthwise oi' the stem for the reception of a bit-shank bent over at the end, said groove being concentric with the axis of rotation of the stock, and a split retaining sleeve embracing said stem and rotatable thereon to open the groove or to close the groove and hold the bit-shank in place against the stem.

2. A bit-holding chuck for carpenters 2 Q r r 1,168,661

braces having astock-engaging shank, a close the groove and hold the bit-shank in 10 cylindrical bit-holding stein eccentric to the place againstithe stem.

shank and having a, lateral base recess eon- In testimony whereof I aflix my signatinued as a groove lengthwise oi the stem ture, in presence of two witnesses.

for the reception of a bit-shank bent over NORMAN MGINNES. at the end said groove being concentric with the shank of the chuck, and a split re- Witnesses: taining sleeve embracing said stem and r0- KATHARINE SOHULZ, c tatable thereon to open the groove or to 1%. A. BEILL.

Copies of this patent maey be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. V 1 

